Attachment for rock-drills.



No. 717,028. Patented Dec. 30, |902.

J. H. REDFIELD.

ATTACHMENT FOR BUCK DRILLS.

(Application filed Apr. 30, 1902.1

(No Model.)

llititrnn Stains FA'rnNi OFFICE.

JOHN H. REDFIELD, OF SPOKANE, NVASHINGTON, ASSIGNOR OF ONE-HALF TO CHARLES GRUTT, EMIL GRUTT, AND FRED GRUTT, OF SPOKANE, VASHINGTON.

ATTACHVI ENT FOR ROCK-DRILLS.

SPECIFICATION forming` part of Letters Patent No. 717,028, dated December 30, 1902.

Application tiled April 30,1902. Serial No. 105,384. (No model.)

To all whom t may concern: When the drill is used for boring a hole Be it known that I, JOHN H. REDFIELD, a adjacent to the root1 or iioor line of a tunnel, citizen of the United States, residing at Spoit becomes impossible to operate the drill efkane, in the county of Spokane and State of fectively, `the comparatively long cranks eml/Vashington, have invented a new and useful ployed coming into Contact With the roof or 55 Attachment for Rock-Drills, of which the folfloor and rendering it impossible to bore an lowing is a specification. opening parallel with and adjacent to the roof This invention relates to certain improveor floor line. It is the object of the present ments in drilling-machines of that general invention to overcome this difficulty by proro class shown in application for United States viding an attachment which may be read- 6o Patent filed by me on November 9, 1901, unily applied to the crank-shaft after the reder Serial No. 81,724, and has for its principal mo val of the cranks and the drill placed close object to provide a device in the nature of an to the roof or floor line and driven from an attachment which may be readily applied to auxiliary crank-shaft located at a short dis- 15 the machine and used for the purpose of optance from the drill and in convenient posi- 65 erating the same from a distance or in places tion for the operator. i where theldrill is placed in a position which On the crank-shaft of a drill to be provided renders it impossible to rotate the cranks in with this attachment is secured a bevel-pinthe ordinary manner, as in places near the ion 10, and on the side of the frame of the zo roof or floor of a tunnel. drill is placed a lug 11, which may be in the 7o The device consists, essentially, inapeculform of 'a block bolted to the side of the iar form of power-transmitting mechanism, frame, or in the manufacture of new drills which maybe applied to the power-shaft of a this lug may be cast with the frame.

rock-drill, such as disclosed in the above- When the attachment forming the subject z 5 named application, as well as to various other of the present invention is not in use and the 75 forms of drills in ordinary use. drill is being operated in the ordinary man- In the accompanying drawings, Figure 1 is ner, the ends of the crank-shaft A receive reside elevation illustrating in general outline movable sockets 12,heldin place by set-screws a rock-drill and the application thereto of a 13 and carrying adjustable cranks 14, which 3o power-transmitting devicein accordance with are operated in the ordinary manner for turn- 8o my invention. Fig. 2 is an end elevation of ing the crank and cam shafts. When the the same, showing the general position of the drill is to be employed in any place where parts when the drill is employed for drilling the cranks will come into contact with an oba hole near the ceiling` or top of a tunnel. struction, such as a iioor orroof of'a tunnel, 3 5 Fig. 3 is a similar View showing the position the sockets 12, together with the cranks, are 8 5 of the parts when the drill is reversed to drill removed from the crank-shaft and on the a hole near the iioor-line. Fig. 4 is a detail latter is placed an adjustable socket 15, which view of asupporting-bar by which the attachmay turn freely on the shaft, but is held ment is held in any position to which it may from longitudinal movement by a removable 4o be adjusted. collar 16 and set-screw'17. 9o

Similar numerals of reference are employed Secured to or formed integral with the socket to indicate corresponding parts throughout 15 is a bracket 1S, carrying a shaft-guiding the several gures of the drawings. tube 19, in which is mounted a short length of The drill, of which only the general outline shai'ting 20, carrying at one end a bevel-pinion 45 is shown, has a crank-shaft A, of any desired 21 for engagement with the pinion 10, and at 95 construction, to which power is applied in the the opposite end being provided with a bevelusual manner by handled cranks at each end pinion 22, adapted to engage a pinion 23 on the to revolve the crank-shaft and cam-shaft in auxiliary crank-shaft 24. On that side of the order to reciprocate the drill-shaft in the usual tube 19 adjacent to the frame of the drill is 5o manner. a lug or boss 25, having a threaded opening roo for the reception of a bolt 26, which extends through an elongated slot 27, formed in a supporting-bar 28, and is bolted to the lug. The opposite end of the bar 28 is secured by a bolt 27 to the frame, lug, or boss 11, the construction and arrangement vbeing such that the elongated slot in the bar 28 Will permit of a considerable range of adjustment ofl the angular position of the tube 19 With respect to the line of the drill-shaft, so that the auxiliary crank-shaft may be placed in a position most convenient for the operator.

To the outer end of the tube 19 is adjustably secured a reversible bracket 29, the latter being held in any position to which it may be adjusted by a set-screw 30. This bracket carries the auxiliary crank-shaft 24, on the opposite ends of which are secured the crank-carrying sockets 12, Which are removed from the main crank-shaft prior to the application thereto of the socket 15. The auxiliarycrank-shaft is of such length that its end portions may be adjusted to bring the cranks outside all portions of the lines of the frame, and thus enable the tube 19 to be adj usted to any position most convenient Without permitting the cranks to come into contact With any portion of the drill.

When the drill is employed with the crankshaft A uppermost to drill a hole near the roof of a tunnel, the parts are adjusted in the position illustrated in Figs. 1 and 2, the drill proper being supported in any desired manner. When the position of the drill is reversed, With the crank-shaft lowermost, to drill a hole near the floor-line the parts are adjusted to the position shown in Fig. 3, it

being noted that the bevel-pinion 23 is now on the opposite side of the bevel-pinion 22 in order to impart suitable rotative movement to the main crank-shaft by a natural movement of the cranks on the auxiliary crank-shaft. This is accomplished byloosening the set-screw 30 and reversing the position of the bracket 29, together with the reversing of the positions of the bevel-gear 23 and t-he filling-sleeve 32. The set-screw 33 in the sleeve 32 is also loosened and the shaft moved longitudinally until the cranks are outside the lines of the rock-drill.

The attachment may be readily connected to'and disconnected from the machine When required, and in many cases it Will be found convenient for the operator, even Where it is gnot necessary to employ the attachment by lous that various changes in the form, proportions, size, and minor details of the structure may be made Without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus described my invention, what I claim is- 1. Au attachmenufor rock-drills, comprising an auxiliary crank-shaft, a bracket carrying the same, a tube to which said bracket is secured, a socket member carried by the tube and adapted for application to and pivotal movement on the main crank-shaft of the drill, and gearing connecting the shafts, substantially as specified.

2. An operating attachment for rock-drills having a main crank-shaft and provided with removable operating-cranks, said attachment comprising a bevel-gear and socket member adapted for application to the main crankshaft of the drill, a bracket forming part of the socket member, a tube carried by the bracket and having at its outer end a reversible bracket, an auxiliary crank-shaft adjustable longitudinally in saidreversible bracket, an auxiliary shaft extending between the two crank shafts, and gearing connecting said shafts, substantially as specified.

3. An operating attachment for rock-drills having a main crank-shaft and provided with removable operating-cran ks, said attachment comprising a bevel-gear and socket member adapted for application to the main crankshaft of the drill, a shaft-carrying-tube, brackets disposed at each end of the tube and adapted yfor the reception of the main crank-shaft and the auxiliary crank-shaft, a shaft carried by the tube, gearing connecting the several shafts, and means for adj ustably supporting the attachment in position, substantially as specied. Y

4. An operating attachment for rock-drills having a main crank-shaft and provided with removable operating-cranks, said attachment comprising a bevel-gear adapted for application to the main crank-shaft of the drill, a tube having brackets at each end for the reception of the main and an auxiliary crankshaft, the bracket carrying the latter shaft being reversible, a connecting-shaft carried by the tube, gearing connecting the several shafts, the vauxiliary crank-shaft being ad-` justable longitudinally to place the operating-crank outside of the frame of the rockdrill, substantially as specified.

5. An operating attachment for rock-drills provided With a main crank-shaft having removable crank-sockets and cranks, said attachment comprising a bevel-gear adapted for application to said main crank-shaft, a tube having brackets at each end for the reception of the main and an auxiliary crank-shaft, the bracket carrying the latter shaft being reversible, a connecting-shaft carried by the tube, gearing connecting the several shafts, a collar carried bythe auxiliary crank-shaft and serving to confine the latter longitudinally in place, and means for adjustably supporting the attachment in position, substantially as specified.

6. The combination of the main and auxiliary crank-shafts, a tube, brackets carried IOO by the tube and adapted for the reception of In testimony that I claim the foregoing as the two shafts, a connecting-shaft carried by my own I have hereto affixed my signature in ro the tube, gearing connecting the several the presence of two witnesses. shafts, a lug or boss formed on said tube, a

second lug carried by the frame of the drill, JOHN H' REDFIELD and a slotted connecting-bar extending be- Witnesses: tween the two lugs and secured to each to FRANK S. APPLEMAN,

conne the attachment in adjusted position. JNO. E. PARKER. 

